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Quantum-size-effect accommodation of gold clusters with altered fluorescence of dyes

机译：染料荧光改变的金团簇的量子尺寸效应调节

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We have synthesized monodispersed Au-25 nanoclusters (NCs) stabilized with eco-friendly glutathione and report here an insight into their interactions with dye molecules. In the presence of such gold NCs, consistent fluorescence quenching was observed for all the dye molecules that we examined in this study regardless of their maximum emission wavelengths. The steady-state and time-resolved spectroscopic results demonstrate that the weakened luminance is associated with the protective ligand pertaining to a static quenching mechanism. Having expounded this issue, we further employed proper laser irradiation enabling dissociation of Au-25(SG)(18) so as to attain a transformation of nonplasmonic NCs into plasmonic gold nanoparticles (NPs) via photo-assisted aggregation of the dissociated gold clusters. As a result, emission enhancement for these dyes was observed, which is largely attributed to the local electromagnetic field enhancement of gold NPs. The alternation of fluorescence quenching to emission enhancement reflects an accommodation of quantum size effects upon the ligand-stabilized gold clusters.
机译：我们合成了用环保型谷胱甘肽稳定的单分散Au-25纳米团簇（NC），并在此报告了它们与染料分子相互作用的见解。在存在此类金NC的情况下，我们在本研究中检查的所有染料分子均观察到一致的荧光猝灭，无论其最大发射波长如何。稳态和时间分辨光谱结果表明，减弱的亮度与属于静态猝灭机理的保护性配体有关。对此问题进行了阐述后，我们进一步采用适当的激光照射使Au-25（SG）（18）发生解离，从而通过解离后的金团簇的光辅助聚集将非等离子体NC转变为等离子体金纳米颗粒（NP）。结果，观察到这些染料的发射增强，这在很大程度上归因于金NP的局部电磁场增强。荧光猝灭与发射增强的交替反映了对配体稳定的金簇的量子尺寸效应的调节。

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